 # RD Sharma Solutions Class 8 Mathematics Solutions for Volume Surface Area Cuboid Cube Exercise 21.4 in Chapter 21 - Volume Surface Area Cuboid Cube

Question 11 Volume Surface Area Cuboid Cube Exercise 21.4

A field is 150m long and 100m wide. A plot (outside the field) 50m long and30m wide is dug to a depth of 8m and the earth taken out from the plot is spread evenly in the field. By how much is the level of field raised?

Given details are, Length of field = 150m Width of field = 100m

Area of field = 150m × 100m = 15000m2

Length of plot = 50m

Breadth of the plot = 30m Depth = 8m

So, volume = l × b × h = 50×30×8 = 12000m3

Let raise in earth level of field on which it spread be ‘h’ metre Volume = l × b × h

h = volume / (l × b)

= 12000 / (50×30)

= 12000 / 1500

= 8cm

∴ The level of field is raised by 8cm.

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